BACKGROUND
The first edition of the AASHTO Highway Safety Manual (HSM) in 2010 provided the transportation industry with a method to estimate crash type and frequency by severity for standard highway facility types. However, the HSM does not address freeway facilities with high-occupancy vehicle (HOV) lanes, high-occupancy toll (HOT) lanes, or other managed-lane strategies.
There are many design elements of freeways with HOV/HOT lanes that influence performance. Research was needed to develop a safety predictive methodology that can be used to estimate the expected crash frequency and severity of a range of freeway facilities with HOV or HOT with various geometric and traffic volume characteristics.
OBJECTIVES
The objectives of this research were to (a) develop a predictive methodology that can be used to estimate crash frequency and severity for freeway facilities, and associated ramps, with HOV or HOT lanes and (b) provide a tool for highway agencies to quantify safety performance in planning, project development, and operation of freeways with HOV or HOT lanes.
STATUS
